One of the oldest, and best, problems in puzzledom is the "Mars" puzzle by owner of puzzle.
Shown here is a map of Mars, circa 1900, showing the canals that were thought to exist at that time. At the junctions of these canals are located 20 pumping stations. For the sake of this puzzle the pumping stations have been labelled with letters. Here is the picture and the puzzle:
If you start at station "T", and make a round-trip tour of all 20 stations, you can spell out a complete English sentence. You must travel along the canals and you can not visit any station more than once.
When the owner of puzzle first published this puzzle, over 50,000 readers wrote in, concerning the solution, that "there is no possible way". See if you can succeed where so many have failed in the past.